What is the definition of xxx Universe? is existence as physical stars, galaxies planets

What is the definition of xxx Universe? is existence as physical stars, galaxies planets.
What are galaxies and xxx many sprawling space  ,gasesGalaxies are  over  billion in
What xx a light ofA  theby light xx one year.travels300000 kilometers per
are  2  components of stars? Helium and
many stars are xx a A a million stars.
do stars produce  fusion.
What is the  contains? Solar refers  and  revolve around it. It consists xx the sun x the  moons, planets, asteroids, comets and  the name of our galaxy?


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